{"id":315,"date":"2020-12-15T16:54:33","date_gmt":"2020-12-15T08:54:33","guid":{"rendered":"http:\/\/blog.cyasylum.top\/?p=315"},"modified":"2020-12-15T17:12:38","modified_gmt":"2020-12-15T09:12:38","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9c-%e7%89%a9%e7%90%86%e5%b1%82","status":"publish","type":"post","link":"http:\/\/blog.cyasylum.top\/index.php\/2020\/12\/15\/%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9c-%e7%89%a9%e7%90%86%e5%b1%82\/","title":{"rendered":"\u8ba1\u7b97\u673a\u7f51\u7edc-\u7269\u7406\u5c42"},"content":{"rendered":"<blockquote>\n<blockquote>\n<p>\u662f\u4eca\u5e74\u4efd\u7684\u590d\u4e60\u63d0\u7eb2\uff0c\u8be5\u90e8\u5206\u4e3a\u8ba1\u7b97\u673a\u7f51\u7edc\u7269\u7406\u5c42<\/p>\n<\/blockquote>\n<\/blockquote>\n<ul>\n<li>\u901a\u4fe1\u57fa\u7840<\/li>\n<li>\u4e24\u4e2a\u516c\u5f0flim<\/li>\n<li>\u770b\u56fe\u8bf4\u8bdd<\/li>\n<li>\u4f20\u8f93\u4ecb\u8d28<\/li>\n<li>\u7269\u7406\u5c42\u8bbe\u5907<\/li>\n<\/ul>\n<h1>\u57fa\u672c\u6982\u5ff5<\/h1>\n<p>\u89e3\u51b3\u5728\u4e0d\u540c\u4f20\u8f93\u5a92\u4f53\u4e0a\u4f20\u8f93\u6570\u636e\u6bd4\u7279\u6d41 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Baud\u00d7n bit\/\u7801\u5143 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Baud\uff0cW\u662f\u4fe1\u9053\u5e26\u5bbd\uff0c\u5355\u4f4d\u662fHz\u3002<\/p>\n<p>\u7406\u60f3\u4f4e\u901a\u4fe1\u9053\u6761\u4ef6\u4e0b\u7684\u6781\u9650\u6570\u636e\u4f20\u8f93\u7387\uff08\u5e26\u5bbd\uff09\u4e3a$$2W\\log_2V(bit\/s)$$<\/p>\n<ul>\n<li>\u5728\u4efb\u4f55\u4fe1\u9053\u4e2d\uff0c\u7801\u5143\u4f20\u8f93\u901f\u7387\u5b58\u5728\u4e0a\u9650\uff0c\u82e5\u4f20\u8f93\u901f\u7387\u8d85\u8fc7\u4e0a\u9650\u5219\u4f1a\u51fa\u73b0\u7801\u95f4\u4e32\u6270\uff0c\u4f7f\u5f97\u63a5\u6536\u7aef\u5bf9\u7801\u5143\u5b8c\u5168\u8bc6\u522b\u4e0d\u53ef\u80fd\u3002<\/li>\n<li>\u4fe1\u9053\u9891\u5e26\u8d8a\u5bbd\uff0c\u5c31\u53ef\u4ee5\u7528\u66f4\u9ad8\u7684\u6ce2\u7279\u7387\u8fdb\u884c\u7801\u5143\u6709\u6548\u4f20\u8f93<\/li>\n<li>\u5948\u6c0f\u51c6\u5219\u7ed9\u51fa\u4e86\u7801\u5143\u4f20\u8f93\u901f\u7387\u7684\u9650\u5236\uff0c\u4f46\u6ca1\u5bf9\u4fe1\u606f\u4f20\u8f93\u901f\u7387\u7ed9\u51fa\u9650\u5236<\/li>\n<li>\u7531\u4e8e\u7801\u5143\u4f20\u8f93\u901f\u7387\u53d7\u5948\u6c0f\u51c6\u5219\u5236\u7ea6\uff0c\u6240\u4ee5\u4e3a\u4e86\u63d0\u9ad8\u4f20\u8f93\u901f\u7387\uff0c\u5fc5\u987b\u8ba9\u6bcf\u4e2a\u7801\u5143\u643a\u5e26\u66f4\u591a\u6bd4\u7279\u4fe1\u606f\u91cf\uff0c\u5373\u591a\u5143\u5236\u8c03\u5236<\/li>\n<\/ul>\n<h2>\u9999\u519c\u5b9a\u7406<\/h2>\n<p>\u9999\u519c\u7b2c\u4e8c\u5b9a\u7406\u5373\u6709\u566a\u4fe1\u53f7\u7f16\u7801\u5b9a\u7406\uff0c\u89c4\u5b9a\u4e86\u6700\u9ad8\u6bd4\u7279\u4f20\u8f93\u901f\u7387\uff0c\u8003\u8651\u7535\u78c1\u5e72\u6270\u53ca\u4fe1\u9053\u5e72\u6270\uff0c\u8003\u8651\u4fe1\u566a\u6bd4<\/p>\n<p>\u4fe1\u53f7\u5e73\u5747\u529f\u7387\/\u566a\u58f0\u5e73\u5747\u529f\u7387\uff0c\u8bb0\u4f5cS\/N\uff0c\u5355\u4f4d\u4e3adB<\/p>\n<p>\u4fe1\u566a\u6bd4\uff08dB\uff09=$$10\\log_{10}S\/N$$ 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Baud.<\/li>\n<li>\u7406\u60f3\u4f4e\u901a\u4fe1\u9053\u4e0b\u7684\u6781\u9650\u6570\u636e\u4f20\u8f93\u7387\u4e3a$$2W\\log_2V$$<\/li>\n<li>\u8981\u60f3\u63d0\u9ad8\u6570\u636e\u7387\uff0c\u5c31\u8981\u63d0\u9ad8\u5e26\u5bbd\/\u91c7\u7528\u66f4\u597d\u7684\u7f16\u7801\u6280\u672f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u9999\u519c\u5b9a\u7406\n<ul>\n<li>\u5e26\u5bbd\u53d7\u9650\u6709\u566a\u58f0\u6761\u4ef6\u4e0b\u7684\u4fe1\u606f\u4f20\u8f93\u901f\u7387\u3002<\/li>\n<li>\u4fe1\u9053\u7684\u6781\u9650\u6570\u636e\u4f20\u8f93\u901f\u7387\u4e3a$$W\\log_2(1+S\/N)$$<\/li>\n<li>\u8981\u60f3\u63d0\u9ad8\u6570\u636e\u7387\uff0c\u5c31\u8981\u63d0\u9ad8\u5e26\u5bbd\/\u4fe1\u566a\u6bd4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1>\u7f16\u7801&amp;\u8c03\u5236<\/h1>\n<h2>\u4fe1\u53f7<\/h2>\n<h3>\u57fa\u5e26\u4fe1\u53f7<\/h3>\n<ul>\n<li>\u5c06\u6570\u5b57\u4fe1\u53f71\u548c0\u76f4\u63a5\u7528\u4e24\u79cd\u4e0d\u540c\u7535\u538b\u8868\u793a\uff0c\u9001\u5230\u6570\u5b57\u4fe1\u9053\u8fdb\u884c\u4f20\u8f93\uff08\u57fa\u5e26\u4f20\u8f93\uff09<\/li>\n<li>\u6765\u81ea\u4fe1\u6e90\u7684\u4fe1\u53f7\uff0c\u76f4\u63a5\u8868\u8fbe\u8981\u4f20\u8f93\u7684\u4fe1\u606f<\/li>\n<li>\u8fd1\u8ddd\u79bb<\/li>\n<\/ul>\n<h3>\u5bbd\u5e26\u4fe1\u53f7<\/h3>\n<ul>\n<li>\u5c06\u57fa\u5e26\u4fe1\u53f7\u8fdb\u884c\u8c03\u5236\u540e\u5f62\u6210\u7684\u9891\u5206\u590d\u7528\u6a21\u62df\u4fe1\u53f7\uff0c\u9001\u5230\u6a21\u62df\u4fe1\u9053\u4e0a\u8fdb\u884c\u4f20\u8f93\uff08\u5bbd\u5e26\u4f20\u8f93\uff09<\/li>\n<li>\u628a\u57fa\u5e26\u4fe1\u53f7\u901a\u8fc7\u8f7d\u6ce2\u8c03\u5236\uff0c\u628a\u9891\u7387\u8303\u56f4\u642c\u79fb\u5230\u8f83\u9ad8\u9891\u6bb5\u540e\u4ee5\u4fbf\u4f20\u8f93<\/li>\n<li>\u8fdc\u8ddd\u79bb<\/li>\n<\/ul>\n<h2>\u7f16\u7801\u4e0e\u8c03\u5236<\/h2>\n<div>\n<table>\n<tbody>\n<tr class=\"evenRow\">\n<td rowspan=\"2\" valign=\"center\">\u6570\u636e<\/td>\n<td>\u6570\u5b57\u4fe1\u53f7<\/td>\n<td>\u7f16\u7801<\/td>\n<\/tr>\n<tr class=\"oddRow\">\n<td>\u6a21\u62df\u4fe1\u53f7<\/td>\n<td>\u8c03\u5236<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr class=\"evenRow\">\n<td rowspan=\"2\" valign=\"center\">\u6570\u5b57\u6570\u636e<\/td>\n<td>\u6570\u5b57\u53d1\u9001\u5668<\/td>\n<td>\u6570\u5b57\u4fe1\u53f7<\/td>\n<\/tr>\n<tr class=\"oddRow\">\n<td>\u8c03\u5236\u5668<\/td>\n<td>\u6a21\u62df\u4fe1\u53f7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr class=\"evenRow\">\n<td rowspan=\"2\" valign=\"center\">\u6a21\u62df\u6570\u636e<\/td>\n<td>PCM\u7f16\u7801\u5668<\/td>\n<td>\u6570\u5b57\u4fe1\u53f7<\/td>\n<\/tr>\n<tr class=\"oddRow\">\n<td>\u653e\u5927\u5668\u8c03\u5236\u5668<\/td>\n<td>\u6a21\u62df\u4fe1\u53f7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>\u6570\u5b57\u6570\u636e\u7f16\u7801\u6570\u5b57\u4fe1\u53f7<\/h2>\n<ul>\n<li>\u975e\u5f52\u96f6\u7f16\u7801<\/li>\n<li>\u5f52\u96f6\u7f16\u7801<\/li>\n<li>\u53cd\u5411\u4e0d\u5f52\u96f6\u7f16\u7801\n<ul>\n<li>1\u4e0d\u53d8\uff0c0\u8df3\u53d8\uff0c\u8fde\u7eed6\u4e2a1\u63d20\uff08\u8fde\u7eed\u4e0d\u53d8\u8df3\u53d8\u5e26\u6765\u540c\u6b65\uff09<\/li>\n<\/ul>\n<\/li>\n<li>\u66fc\u5f7b\u65af\u7279\u7f16\u7801*\n<ul>\n<li>1\u51481\u540e0\uff0c0\u51480\u540e1\uff0c\u4f20\u8f93\u901f\u7387\u4e3a\u8c03\u5236\u901f\u73871\/2\uff0c\u5b58\u5728\u6d6a\u8d39<\/li>\n<\/ul>\n<\/li>\n<li>\u5dee\u5206\u66fc\u5f7b\u65af\u7279\u7f16\u7801*\n<ul>\n<li>\u4ea4\u754c\u524d\u540e\u76f8\u540c\u8868\u793a1\uff0c\u524d\u540e\u4e0d\u540c\u8868\u793a0<\/li>\n<\/ul>\n<\/li>\n<li>4B\/5B\u7f16\u7801\n<ul>\n<li>5bit\u7f16\u78014bit\uff0c\u6548\u738780%<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/kodo.cyasylum.top\/2020\/12\/15\/7ff54ec1a9d50.png\" alt=\"\" \/><\/p>\n<h2>\u6570\u5b57\u6570\u636e\u8c03\u5236\u6a21\u62df\u4fe1\u53f7<\/h2>\n<ul>\n<li>ASK\u8c03\u5e45<\/li>\n<li>FSK\u8c03\u9891<\/li>\n<li>PSK\u8c03\u76f8<\/li>\n<li>QAM\u8c03\u5e45\u8c03\u76f8<\/li>\n<\/ul>\n<h2>\u6a21\u62df\u6570\u636e\u7f16\u7801\u6570\u5b57\u4fe1\u53f7<\/h2>\n<p>\u8109\u7801\u8c03\u5236PCM\uff0c\u62bd\u6837\u3001\u91cf\u5316\u3001\u7f16\u7801 <em>\u62bd\u6837\uff1a\u53d6\u79bb\u6563\u70b9\uff0c\u6839\u636e\u5948\u594e\u65af\u7279\u91c7\u6837\u5b9a\u7406\u91c7\u6837\u9891\u7387\u5927\u4e8e\u7b49\u4e8e\u4e24\u500d\u4fe1\u53f7\u6700\u9ad8\u9891\u7387 <\/em>\u91cf\u5316\uff1a\u7535\u5e73\u5e45\u503c\u6309\u5206\u7ea7\u6807\u5ea6\u8f6c\u5316\u4e3a\u6570\u5b57\u503c\u53d6\u6574 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